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gladu [14]
3 years ago
6

Simplify and solve this equation: 4m + 9 + 5m – 12 = 42.

Mathematics
2 answers:
GenaCL600 [577]3 years ago
4 0
4m + 9 + 5m – 12 = 42
Given the equation combine all similar terms found on a side of the equation.
You can add the "m" and get: 9m + 9 – 12 = 42
You can combine the 9 and the -12 and get: 9m - 3 = 42
To get the "m" alone add or subtract any number necessary from the left side so the number is 0, and do the same to the right: 9m - 3 + 3 = 42 + 3, leaving you: 9m = 45
Divide each side by the number of "m" you have: (9m)/9 = 45/9 which simplifies to m=5.
Katyanochek1 [597]3 years ago
3 0
I think that the answer is <span>D. m = 5</span>
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Answer:

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t = -------------------- = ---------- min

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The variable t, representing elapsed time, is common to both terms on the left.  Thus,

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